Oil lamp



FIG. 1 is a left front perspective view of an oil lamp embodying my design;

FIG. 2 is a rear elevational view thereof, the front view being a mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof, the left side view being a mirror image thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an oil lamp, as shown. 